Hammer



FIG. 1 is a perspective view of a hammer showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is an enlarged perspective view thereof; and,

FIG. 6 is an enlarged top plan view thereof.

The broken line showing of the handle and the nail are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hammer, as shown and described. 